JPH10284344A - Variable capacitor and its adjusting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently adjust the capacitance, by making a part of an external electrode which faces an inner electrode as a capacitance forming part, and arranging a part in which an electrode is not formed and a laminated member is exposed between the capacitance forming part and a second I/O electrode. SOLUTION: In a variable capacitor, a dielectric sheet 4 on which an external electrode 3 is printed is arranged on a dielectric sheet 2 on which an inner electrode 1 is printed, and a laminated member 5 is formed. A first I/O electrode 6 to which the inner electrode 1 is connected and a second I/O electrode 7 to which the external electrode 3 is connected are arranged on the side surfaces of the laminated member 5. The external electrode 3 is constituted of a capacitance forming part 8 which faces the inner electrode 1 and forms capacitance, and a connecting part 9 for connecting the capacitance forming part 8 and the second I/O electrode 7. A part 10 in which an electrode is not formed and the laminated member 5 is exposed between the capacitance forming part 8 and the second I/O electrode 7 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable capacitor used for various electronic devices and a method for adjusting the same.

[0002]

2. Description of the Related Art In a conventional variable capacitor, an internal electrode provided on an inner layer of a laminate and an external electrode provided on a surface of the laminate face each other to form a capacitor, and the external electrode is removed. By moving, the capacity was adjusted.

[0003]

In such a variable capacitor, since the external electrode portion facing the internal electrode cannot be accurately grasped, the external electrode portion not facing the internal electrode when adjusting the variable capacitor, that is, the adjustment, is performed. The external electrode portion which is not related to the above is removed, and the adjustment time is lengthened accordingly.

Accordingly, an object of the present invention is to solve such a problem and to provide a variable capacitor capable of efficiently adjusting the capacitance.

[0005]

In order to achieve the above object, according to the present invention, a portion of an external electrode opposed to an internal electrode is laminated between a capacitor forming portion and the second input / output electrode. A non-electrode forming portion with an exposed body is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a laminate comprising a plurality of dielectric sheets, first and second input / output electrodes provided on opposite side surfaces of the laminate, An internal electrode provided on the inner layer of the laminate and connected to the first input / output electrode; and an external electrode provided on the upper surface of the laminate and facing the internal electrode and connected to the second input / output electrode. And a non-electrode forming portion in which the laminate is exposed between the capacity forming portion and the second input / output electrode, wherein a portion of the external electrode facing the internal electrode is defined as a capacitor forming portion. By providing the non-electrode forming portion, a portion where the internal electrodes of the external electrodes face each other is clarified, and the efficiency of capacitance adjustment is improved.

According to a second aspect of the present invention, the external electrode comprises:
A capacitor forming portion and a connecting portion connecting the capacitor forming portion to a second input / output electrode; and the connecting portion is provided at both ends of a side of the capacitor forming portion facing the second input / output electrode. 2. The variable capacitor according to claim 1, wherein the connection portions are provided on both ends of the external electrode, so that even if one connection portion is deleted, the other connection portion is connected. As a result, defects due to adjustment can be prevented.

According to a third aspect of the present invention, the external electrode comprises:
2. The variable capacitor according to claim 1, further comprising a capacitor forming portion and a connecting portion connecting the capacitor forming portion to the second input / output electrode, wherein the connecting portion is embedded in an inner layer of the laminate. In addition, it is possible to prevent the occurrence of an inductance component in the connection portion, and to suppress the characteristic deterioration of the variable capacitor.

According to a fourth aspect of the present invention, there is provided a laminate comprising a plurality of dielectric sheets, first and second input / output electrodes provided on opposing side surfaces of the laminate, and An internal electrode provided on an inner layer and connected to the first input / output electrode; and an external electrode provided on the upper surface of the laminate and facing the internal electrode and connected to the second input / output electrode. In the variable capacitor, it is preferable that the external electrode is removed in a direction from the first input / output electrode to the second input / output electrode or in a direction from the second input / output electrode to the first input / output electrode. This is a characteristic variable capacitor adjusting method that can adjust the capacitance of the variable capacitor with higher accuracy.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the variable capacitor, and FIG. 2 is a sectional view of the variable capacitor taken along line XX.

In the variable capacitor, a dielectric sheet 4 on which an external electrode 3 is printed is arranged on a dielectric sheet 2 on which an internal electrode 1 is printed to form a laminated body 5. , The first input / output electrode 6 to which the internal electrode 1 is connected
And a second input / output electrode 7 to which the external electrode 3 is connected.

As shown in FIG. 2, the variable capacitor thus configured has a capacity formed by the internal electrode 1 and the external electrode 3 facing each other, and the external electrode 3 exposed on the surface of the variable capacitor is laser trimmed. Thus, the capacitance is adjusted by reducing the facing area between the internal electrode 1 and the external electrode 3 by removing using the method described above.

As shown in FIG. 1, the external electrode 3 has a capacitance forming portion 8 facing the internal electrode 1 and forming a capacitance, and a connecting portion connecting the capacitance forming portion 8 and the second input / output electrode 7. The non-electrode forming portion 10 in which the laminated body 5 is exposed is formed between the capacitance forming portion 8 and the second input / output electrode 7, thereby forming a capacitance forming portion 8 that acts on the capacitance adjustment. This makes it possible to prevent removal of the portion of the external electrode 3 that is not related to the capacitance adjustment, thereby shortening the time required for the capacitance adjustment.

For example, when the non-electrode forming portion 10 is not provided on the external electrode 3, it is possible to distinguish between a portion forming a capacitor and a portion simply connected to the second input / output electrode 7. However, if the capacitance is adjusted in this state, trimming is performed to a portion only connected to the input / output electrode which does not affect the capacitance adjustment, and much time must be spent. However, as described above, the provision of the non-electrode formation portion 10 on the external electrode 3 makes the capacitance formation portion 8 of the external electrode 3 facing the internal electrode 1 clear, thereby reducing the time required for capacitance adjustment.

When designing a variable capacitor having a large initial capacitance value, the interval between the internal electrode 1 and the external electrode 3 is set to be small. In some cases, the dielectric sheet 4 and the internal electrode 1 located below may be scraped off together. If the trimming direction is set as indicated by the broken arrow A, the external electrode 3 is trimmed from one end to the other end, so that the internal electrode 1 located thereunder is also scraped off. . As a result, the internal electrode 1 and the first input / output electrode 6 are separated, and it is impossible to obtain a desired capacitance.

Therefore, the direction of trimming with respect to the external electrode 3 is indicated by the solid arrow B in the direction from the first input / output electrode 6 to the second input / output electrode 7 or from the second input / output electrode 7 to the second input / output electrode 7. If the setting is made such that the external electrode 3 is removed in the direction of the first input / output electrode 6, the internal electrode 1 and the first input / output electrode 6 are separated even if the internal electrode 1 is cut off by trimming. Therefore, the trimming can be continued until the desired capacitance value is obtained.

The non-electrode forming portion 10 is connected to the variable capacitor.
Is formed, connection portions 9 are provided on both ends of the capacitance formation portion 8, and the non-electrode formation portions 10 are arranged between the connection portions 9. By providing the non-electrode forming portion 10 in this manner, the capacity forming portion 8 can be clarified, and the connection portions 9 are provided at both ends of the capacity forming portion 8. Even when the portion 9 is removed, the conduction between the capacitance forming portion 8 and the second input / output electrode 7 is maintained by the other connecting portion 9. That is, it is possible to prevent the occurrence of an adjustment failure due to the adjustment. Since the connecting portions 9 are provided at the ends of the capacitance forming portion 8, respectively, the distance between them is widened, so that the occurrence of poor adjustment due to the adjustment can be further prevented.

However, when the capacitance forming section 8 and the second input / output electrode 7 are connected via the connecting section 9 as described above, the connecting section 9 becomes an inductance component. There remains such a problem that the maximum capacitance value of the variable capacitor obtained by facing the external electrode 3 is reduced.

Therefore, as shown in FIG.
Is printed on the dielectric sheet 2 and embedded in the inner layer of the laminate 5,
If a plurality of through holes 11 as shown in FIG. 4 are used to connect to the capacitance forming portion 8, the inductance component generated between the capacitance forming portion 8 and the second input / output electrode 7 can be minimized. In addition, the capacitance value can be prevented from lowering.

[0020]

As described above, according to the present invention, the non-electrode formation portion where the laminated body is exposed is provided between the capacitance formation portion of the external electrode and the second input / output electrode. Since the capacitance forming portion directly acting on the capacitance adjustment becomes clear, the external electrode portion not acting on the capacitance adjustment is not removed, and the efficiency of the capacitance adjustment can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a variable capacitor according to an embodiment of the present invention.

FIG. 2 is a sectional view of the variable capacitor.

FIG. 3 is an exploded perspective view of another variable capacitor.

FIG. 4 is a sectional view of the variable capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal electrode 2 Dielectric sheet 3 External electrode 4 Dielectric sheet 5 Laminated body 6 1st input / output electrode 7 2nd input / output electrode 8 Capacity formation part 9 Connection part 10 Non-electrode formation part

Claims (4)

[Claims] 1. A laminate comprising a plurality of dielectric sheets,
First and second input / output electrodes provided on opposing side surfaces of the multilayer body, internal electrodes provided on inner layers of the multilayer body and connected to the first input / output electrodes, And an external electrode provided on the upper surface of the laminate and connected to the second input / output electrode. A portion of the external electrode facing the internal electrode is a capacitance forming portion, A variable capacitor comprising a non-electrode forming portion in which the laminate is exposed between the second input / output electrode and the second input / output electrode. 2. The external electrode includes a capacitor forming portion and a connecting portion connecting the capacitor forming portion to a second input / output electrode. The connecting portion is connected to a second input / output electrode in the capacitor forming portion. 2. The variable capacitor according to claim 1, wherein the variable capacitor is provided at both ends of opposite sides. 3. An external electrode comprising a capacitor forming portion and a connecting portion connecting the capacitor forming portion to a second input / output electrode, wherein the connecting portion is embedded in an inner layer of the laminate. Item 7. The variable capacitor according to Item 1. 4. A laminate comprising a plurality of dielectric sheets,
First and second input / output electrodes provided on opposing side surfaces of the multilayer body, internal electrodes provided on inner layers of the multilayer body and connected to the first input / output electrodes, A variable capacitor having an external electrode provided on the upper surface of the laminate and connected to the second input / output electrode, in a direction from the first input / output electrode to the second input / output electrode or A method of adjusting a variable capacitor, comprising: removing the external electrode from the second input / output electrode toward the first input / output electrode.